What is the Complement in $R$ of

$A=\{xinR$:$x>4\}?$

$A^c=\{xinR$:$x<mn\; id="EditorElement\_36574">4</mn><mi\; id="EditorElement\_36576">\}</mi>$

$A^c=\{xinR$:$x4\}$

$A^c=C$

$A^c=\{\}$